.nav{
    overflow: hidden;
}
.sk{
    position: absolute;
    left: 190px;
    top: 40px;
    border-left: 1px solid red;
    padding: 3px 0 0 14px;
}
.sk_list{
    float: left;
}
.sk_list ul li{
    float: left;
}
.sk_list ul li a{
    display: block;
    line-height: 47px;
    padding: 0 30px;
    font-size: 16px;
    font-weight: 700;
}
.sk_con{
    float: left;
}
.sk_con ul li{
    float: left;
}
.sk_con ul li a {
    display: block;
    line-height: 49px;
    padding: 0 20px;
    font-size: 14px;     
    
}
.sk_con ul li:last-child a::after{
    content: '\e91e';
    font-family: 'icomoon';
}
.sk_bd ul{
    overflow: hidden;
}
.sk_bd ul li{
    overflow: hidden;
    float: left;
    margin-right: 13px;
    width: 290px;
    height: 460px;
    border: 1px solid transparent;
}
.sk_bd ul li:nth-child(4n){
    margin-right: 0;
}
.sk_bd ul li:hover{
    border: 1px solid red;
}